{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d696d536f0a97ac779d6176107ac4e96d0a2f8b9"
            },
            {
              "fixed": "287a34c4d712e0bdb67751e21316d9c8d75a528a"
            },
            {
              "fixed": "8ee521b8b189799e361d4233c5180ba56656d4d4"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.0"
            },
            {
              "fixed": "7.2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98177.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Avoid integer underflow in EOP ring size calculation.\n\nThe low 6 bits of cp_hqd_eop_control store the base-2 logarithm\nof the EOP ring size. This was calculated as\n\norder_base_2(q-\u003eeop_ring_buffer_size / 4) - 1\n\nBut order_base_2 can in theory return 0, so this could underflow\n(although in practice the ring buffer size cannot be less than 4096).\n\nChange this to\n\norder_base_2(q-\u003eeop_ring_buffer_size / 8)\n\nusing properties of logarithms.\n\nAlso add to the above comment to make the mathematics more clear.\n\n(cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)",
  "id": "CVE-2026-98177",
  "modified": "2026-10-09T02:31:11.136550766Z",
  "published": "2026-10-06T08:44:20.807Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/287a34c4d712e0bdb67751e21316d9c8d75a528a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ee521b8b189799e361d4233c5180ba56656d4d4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98177.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98177"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "drm/amdkfd: Avoid integer underflow in EOP ring size calculation."
}